Priority handling for a random access message that includes a preamble and a payload

ABSTRACT

This disclosure provides systems, methods and apparatus for assisting a user equipment (UE) with balancing quality of service (QoS) requirements (such as access latency or reliability requirements) and consumption of high priority network resources (such as for load balancing) when transmitting a random access message (RAM) in a two-step random access channel (RACH) procedure. As a result, the UE may be capable of satisfying QoS requirements for the RAM while reducing an impact of transmission of the RAM on other uplink transmissions. Furthermore, some techniques and apparatuses described herein assist a UE with prioritizing portions of the RAM in different UE operating modes, such as a dual connectivity mode, a carrier aggregation mode, or a supplemental uplink mode. Some techniques and apparatuses described herein employ cross-carrier scheduling, dynamic power sharing, or dynamic power control to achieve these and other performance improvements.

CROSS-REFERENCE TO RELATED APPLICATION

This Patent Application claims priority to U.S. Provisional PatentApplication No. 62/820,075, filed on Mar. 18, 2019, entitled “PRIORITYHANDLING FOR A RANDOM ACCESS MESSAGE THAT INCLUDES A PREAMBLE AND APAYLOAD,” and assigned to the assignee hereof. The disclosure of theprior Application is considered part of and is incorporated by referencein this Patent Application.

TECHNICAL FIELD

Aspects of the present disclosure relate generally to wirelesscommunication and to techniques for priority handling a random accessmessage that includes a preamble and a payload.

DESCRIPTION OF THE RELATED TECHNOLOGY

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,and broadcasts. Typical wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources (for example,bandwidth, transmit power, etc.). Examples of such multiple-accesstechnologies include code division multiple access (CDMA) systems, timedivision multiple access (TDMA) systems, frequency-division multipleaccess (FDMA) systems, orthogonal frequency-division multiple access(OFDMA) systems, single-carrier frequency-division multiple access(SC-FDMA) systems, time division synchronous code division multipleaccess (TD-SCDMA) systems, and Long Term Evolution (LTE).LTE/LTE-Advanced is a set of enhancements to the Universal MobileTelecommunications System (UMTS) mobile standard promulgated by theThird Generation Partnership Project (3GPP).

A wireless communication network may include a number of base stations(BSs) that can support communication for a number of user equipment(UEs). A user equipment (UE) may communicate with a base station (BS)via the downlink (DL) and uplink (UL). The DL (or forward link) refersto the communication link from the BS to the UE, and the UL (or reverselink) refers to the communication link from the UE to the BS. As will bedescribed in more detail herein, a BS may be referred to as a NodeB, anLTE evolved nodeB (eNB), a gNB, an access point (AP), a radio head, atransmit receive point (TRP), a New Radio (NR) BS, a 5G NodeB, or thelike.

The above multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent UEs to communicate on a municipal, national, regional, andeven global level. NR, which also may be referred to as 5G, is a set ofenhancements to the LTE mobile standard promulgated by the ThirdGeneration Partnership Project (3GPP). NR is designed to better supportmobile broadband Internet access by improving spectral efficiency,lowering costs, improving services, making use of new spectrum, andbetter integrating with other open standards using OFDM with a cyclicprefix (CP) (CP-OFDM) on the DL, using CP-OFDM or SC-FDM (for example,also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) onthe UL (or a combination thereof), as well as supporting beamforming,multiple-input multiple-output (MIMO) antenna technology, and carrieraggregation.

SUMMARY

The systems, methods and devices of this disclosure each have severalinnovative aspects, no single one of which is solely responsible for thedesirable attributes disclosed herein.

One innovative aspect of the subject matter described in this disclosurecan be implemented in a method of wireless communication performed by auser equipment (UE). The method may include determining a first transmitpower for transmission of a preamble of a random access message based atleast in part on a first set of parameters; determining a secondtransmit power for transmission of a payload of the random accessmessage based at least in part on a second set of parameters, where therandom access message includes both the preamble and the payload;transmitting the preamble using the first transmit power; andtransmitting the payload using the second transmit power.

In some aspects, the first set of parameters is different from thesecond set of parameters. In some aspects, the first set of parametersincludes at least one of: a transmission occasion in which the preambleis to be transmitted, a carrier to be used to transmit the preamble, apathloss measurement for the carrier to be used to transmit thepreamble, a transmission bandwidth assigned for transmission of thepreamble, a power spectral density target for transmission of thepreamble, a pathloss compensation factor for transmission of thepreamble, or a combination thereof. In some aspects, the second set ofparameters includes at least one of: a transmission occasion in whichthe payload is to be transmitted, a carrier to be used to transmit thepayload, a pathloss measurement for the carrier to be used to transmitthe payload, a transmission bandwidth assigned for transmission of thepayload, a power spectral density target for transmission of thepayload, a pathloss compensation factor for transmission of the payload,or a combination thereof.

In some aspects, at least one of the first transmit power or the secondtransmit power is higher than a transmit power used for other uplinktransmissions that overlap with the preamble or the payload of therandom access message. In some aspects, the other uplink transmissionsinclude at least one of a sounding reference signal (SRS), a physicaluplink control channel (PUCCH) communication, or a physical uplinkshared channel (PUSCH) transmission. In some aspects, the first transmitpower is higher than the second transmit power.

Another innovative aspect of the subject matter described in thisdisclosure can be implemented in a UE for wireless communication. The UEmay include memory and one or more processors operatively coupled to thememory. The memory and the one or more processors may be configured todetermine a first transmit power for transmission of a preamble of arandom access message based at least in part on a first set ofparameters; determine a second transmit power for transmission of apayload of the random access message based at least in part on a secondset of parameters, where the random access message includes both thepreamble and the payload; transmit the preamble using the first transmitpower; and transmit the payload using the second transmit power.

In some aspects, the first set of parameters is different from thesecond set of parameters. In some aspects, the first set of parametersincludes at least one of: a transmission occasion in which the preambleis to be transmitted, a carrier to be used to transmit the preamble, apathloss measurement for the carrier to be used to transmit thepreamble, a transmission bandwidth assigned for transmission of thepreamble, a power spectral density target for transmission of thepreamble, a pathloss compensation factor for transmission of thepreamble, or a combination thereof. In some aspects, the second set ofparameters includes at least one of: a transmission occasion in whichthe payload is to be transmitted, a carrier to be used to transmit thepayload, a pathloss measurement for the carrier to be used to transmitthe payload, a transmission bandwidth assigned for transmission of thepayload, a power spectral density target for transmission of thepayload, a pathloss compensation factor for transmission of the payload,or a combination thereof.

In some aspects, at least one of the first transmit power or the secondtransmit power is higher than a transmit power used for other uplinktransmissions that overlap with the preamble or the payload of therandom access message. In some aspects, the other uplink transmissionsinclude at least one of a sounding reference signal (SRS), a physicaluplink control channel (PUCCH) communication, or a physical uplinkshared channel (PUSCH) transmission. In some aspects, the first transmitpower is higher than the second transmit power.

Yet another innovative aspect of the subject matter described in thisdisclosure can be implemented in a non-transitory computer-readablemedium storing one or more instructions for wireless communication. Theone or more instructions, when executed by one or more processors of aUE, may cause the one or more processors to determine a first transmitpower for transmission of a preamble of a random access message based atleast in part on a first set of parameters; determine a second transmitpower for transmission of a payload of the random access message basedat least in part on a second set of parameters, where the random accessmessage includes both the preamble and the payload; transmit thepreamble using the first transmit power; and transmit the payload usingthe second transmit power.

In some aspects, the first set of parameters is different from thesecond set of parameters. In some aspects, the first set of parametersincludes at least one of: a transmission occasion in which the preambleis to be transmitted, a carrier to be used to transmit the preamble, apathloss measurement for the carrier to be used to transmit thepreamble, a transmission bandwidth assigned for transmission of thepreamble, a power spectral density target for transmission of thepreamble, a pathloss compensation factor for transmission of thepreamble, or a combination thereof. In some aspects, the second set ofparameters includes at least one of: a transmission occasion in whichthe payload is to be transmitted, a carrier to be used to transmit thepayload, a pathloss measurement for the carrier to be used to transmitthe payload, a transmission bandwidth assigned for transmission of thepayload, a power spectral density target for transmission of thepayload, a pathloss compensation factor for transmission of the payload,or a combination thereof.

In some aspects, at least one of the first transmit power or the secondtransmit power is higher than a transmit power used for other uplinktransmissions that overlap with the preamble or the payload of therandom access message. In some aspects, the other uplink transmissionsinclude at least one of a sounding reference signal (SRS), a physicaluplink control channel (PUCCH) communication, or a physical uplinkshared channel (PUSCH) transmission. In some aspects, the first transmitpower is higher than the second transmit power.

Still another innovative aspect of the subject matter described in thisdisclosure can be implemented in an apparatus for wirelesscommunication. The apparatus may include means for determining a firsttransmit power for transmission of a preamble of a random access messagebased at least in part on a first set of parameters; means fordetermining a second transmit power for transmission of a payload of therandom access message based at least in part on a second set ofparameters, where the random access message includes both the preambleand the payload; means for transmitting the preamble using the firsttransmit power; and means for transmitting the payload using the secondtransmit power.

In some aspects, the first set of parameters is different from thesecond set of parameters. In some aspects, the first set of parametersincludes at least one of: a transmission occasion in which the preambleis to be transmitted, a carrier to be used to transmit the preamble, apathloss measurement for the carrier to be used to transmit thepreamble, a transmission bandwidth assigned for transmission of thepreamble, a power spectral density target for transmission of thepreamble, a pathloss compensation factor for transmission of thepreamble, or a combination thereof. In some aspects, the second set ofparameters includes at least one of: a transmission occasion in whichthe payload is to be transmitted, a carrier to be used to transmit thepayload, a pathloss measurement for the carrier to be used to transmitthe payload, a transmission bandwidth assigned for transmission of thepayload, a power spectral density target for transmission of thepayload, a pathloss compensation factor for transmission of the payload,or a combination thereof.

In some aspects, at least one of the first transmit power or the secondtransmit power is higher than a transmit power used for other uplinktransmissions that overlap with the preamble or the payload of therandom access message. In some aspects, the other uplink transmissionsinclude at least one of a sounding reference signal (SRS), a physicaluplink control channel (PUCCH) communication, or a physical uplinkshared channel (PUSCH) transmission. In some aspects, the first transmitpower is higher than the second transmit power.

Another innovative aspect of the subject matter described in thisdisclosure can be implemented in a method of wireless communicationperformed by a user equipment (UE). The method may include determining aquality of service (QoS) requirement associated with a payload of arandom access message, where the random access message includes apreamble and the payload; and transmitting the preamble and the payloadbased on a priority that is determined using the QoS requirement.

In some aspects, the priority is determined based on a determinationthat the UE is operating in a carrier aggregation mode, a dualconnectivity mode, or a supplemental uplink mode. In some aspects, thepriority relates to multiple cell groups, multiple frequency ranges, ormultiple component carriers with which the UE is configured to operate.In some aspects, the priority indicates at least one of: a cell group onwhich at least one of the preamble or the payload is to be transmitted,a component carrier on which at least one of the preamble or the payloadis to be transmitted, a transmission power with which at least one ofthe preamble or the payload is to be transmitted, or a combinationthereof.

In some aspects, the preamble and the payload are transmitted using asame cell group based on a determination that the QoS requirementsatisfies a threshold. In some aspects, the threshold is based on atleast one of a collision probability of random selection of preamble ordemodulation reference signal (DMRS) sequences, available transmissionoccasions on different uplink carriers, one or more channel qualitymeasurements, one or more interference measurements, or a combinationthereof. In some aspects, the preamble and the payload are transmittedusing different cell groups based on a determination that the QoSrequirement does not satisfy a threshold.

In some aspects, the priority is determined based on whether the randomaccess message is to be transmitted as an initial transmission or are-transmission. In some aspects, the priority is determined based on adetermination that the UE is configured with a first cell group thatuses a first frequency range and is configured with a second cell groupthat uses a second frequency range. In some aspects, the first frequencyrange is a sub-6 gigahertz frequency range and the second frequencyrange is at least one of a millimeter wave frequency range, a differentcarrier frequency within the sub-6 gigahertz frequency range that has adifferent pathloss than the first frequency range, or an unlicensedspectrum frequency range. In some aspects, the preamble and the payloadare transmitted using the first cell group based on a determination thatthe QoS requirement satisfies a threshold. In some aspects, the preambleis transmitted using the first cell group and the payload is transmittedusing the second cell group based on a determination that the QoSrequirement does not satisfy a threshold. In some aspects, the preambleand the payload are transmitted using a different cell group for a firsttransmission occasion and are transmitted using a same cell group for asecond transmission occasion.

In some aspects, the priority is determined based on a determinationthat the UE is configured with a first cell group having a higherdensity of transmission occasions or a higher peak power constraint anda second cell group having a lower density of transmission occasions ora lower peak power constraint. In some aspects, the first cell group andthe second cell group use a same frequency range. In some aspects, thepreamble and the payload are transmitted using the first cell groupbased on a determination that the QoS requirement satisfies a threshold.is the preamble is transmitted using the first cell group and thepayload is transmitted using the second cell group based on adetermination that the QoS requirement does not satisfy a threshold.

In some aspects, the preamble and the payload are transmitted using asame transmit power based on a determination that the QoS requirementsatisfies a threshold. In some aspects, the same transmit power ishigher than a transmit power used for other uplink transmissions thatoverlap with the preamble or the payload of the random access message.In some aspects, the preamble and the payload are transmitted usingdifferent transmit powers based on a determination that the QoSrequirement does not satisfy a threshold. In some aspects, the thresholdis based on at least one of a collision probability of random selectionof preamble or DMRS sequences, available transmission occasions ondifferent uplink carriers, one or more channel quality measurements, oneor more interference measurements, or a combination thereof. In someaspects, a first transmit power used for the preamble is higher than asecond transmit power used for the payload and is higher than a transmitpower used for other uplink transmissions that overlap with the preambleof the random access message.

In some aspects, the UE is configured to disable uplink transmissionsthat overlap with the preamble or the payload of the random accessmessage. In some aspects, the uplink transmissions are disabled on oneor more carriers that are not configured with transmission occasions forthe random access message. In some aspects, uplink control informationfor the disabled uplink transmissions is multiplexed with the payload ofthe random access message.

In some aspects, a transmit power for the preamble is dynamicallyconfigured based on at least one of: a transmission occasion in whichthe preamble is to be transmitted, a carrier to be used to transmit thepreamble, a pathloss measurement for the carrier, a transmissionbandwidth assigned for transmission of the preamble, a power spectraldensity target for transmission of the preamble, a pathloss compensationfactor for transmission of the preamble, or a combination thereof. Insome aspects, a transmit power for the payload is dynamically configuredbased on at least one of: a transmission occasion in which the payloadis to be transmitted, a carrier to be used to transmit the payload, apathloss measurement for the carrier, a transmission bandwidth assignedfor transmission of the payload, a power spectral density target fortransmission of the payload, a pathloss compensation factor fortransmission of the payload, or a combination thereof. In some aspects,the QoS requirement is based at least in part on a reference signalreceived power (RSRP) parameter.

Another innovative aspect of the subject matter described in thisdisclosure can be implemented in a UE for wireless communication. The UEmay include memory and one or more processors operatively coupled to thememory. The memory and the one or more processors may be configured todetermine a QoS requirement associated with a payload of a random accessmessage, where the random access message includes a preamble and thepayload; and transmit the preamble and the payload based on a prioritythat is determined using the QoS requirement.

In some aspects, the priority is determined based on a determinationthat the UE is operating in a carrier aggregation mode, a dualconnectivity mode, or a supplemental uplink mode. In some aspects, thepriority relates to multiple cell groups, multiple frequency ranges, ormultiple component carriers with which the UE is configured to operate.In some aspects, the priority indicates at least one of: a cell group onwhich at least one of the preamble or the payload is to be transmitted,a component carrier on which at least one of the preamble or the payloadis to be transmitted, a transmission power with which at least one ofthe preamble or the payload is to be transmitted, or a combinationthereof.

In some aspects, the preamble and the payload are transmitted using asame cell group based on a determination that the QoS requirementsatisfies a threshold. In some aspects, the threshold is based on atleast one of a collision probability of random selection of preamble ordemodulation reference signal (DMRS) sequences, available transmissionoccasions on different uplink carriers, one or more channel qualitymeasurements, one or more interference measurements, or a combinationthereof. In some aspects, the preamble and the payload are transmittedusing different cell groups based on a determination that the QoSrequirement does not satisfy a threshold.

In some aspects, the priority is determined based on whether the randomaccess message is to be transmitted as an initial transmission or are-transmission. In some aspects, the priority is determined based on adetermination that the UE is configured with a first cell group thatuses a first frequency range and is configured with a second cell groupthat uses a second frequency range. In some aspects, the first frequencyrange is a sub-6 gigahertz frequency range and the second frequencyrange is at least one of a millimeter wave frequency range, a differentcarrier frequency within the sub-6 gigahertz frequency range that has adifferent pathloss than the first frequency range, or an unlicensedspectrum frequency range. In some aspects, the preamble and the payloadare transmitted using the first cell group based on a determination thatthe QoS requirement satisfies a threshold. In some aspects, the preambleis transmitted using the first cell group and the payload is transmittedusing the second cell group based on a determination that the QoSrequirement does not satisfy a threshold. In some aspects, the preambleand the payload are transmitted using a different cell group for a firsttransmission occasion and are transmitted using a same cell group for asecond transmission occasion.

In some aspects, the priority is determined based on a determinationthat the UE is configured with a first cell group having a higherdensity of transmission occasions or a higher peak power constraint anda second cell group having a lower density of transmission occasions ora lower peak power constraint. In some aspects, the first cell group andthe second cell group use a same frequency range. In some aspects, thepreamble and the payload are transmitted using the first cell groupbased on a determination that the QoS requirement satisfies a threshold.The preamble is transmitted using the first cell group and the payloadis transmitted using the second cell group based on a determination thatthe QoS requirement does not satisfy a threshold.

In some aspects, the preamble and the payload are transmitted using asame transmit power based on a determination that the QoS requirementsatisfies a threshold. In some aspects, the same transmit power ishigher than a transmit power used for other uplink transmissions thatoverlap with the preamble or the payload of the random access message.In some aspects, the preamble and the payload are transmitted usingdifferent transmit powers based on a determination that the QoSrequirement does not satisfy a threshold. In some aspects, the thresholdis based on at least one of a collision probability of random selectionof preamble or DMRS sequences, available transmission occasions ondifferent uplink carriers, one or more channel quality measurements, oneor more interference measurements, or a combination thereof. In someaspects, a first transmit power used for the preamble is higher than asecond transmit power used for the payload and is higher than a transmitpower used for other uplink transmissions that overlap with the preambleof the random access message.

In some aspects, the UE is configured to disable uplink transmissionsthat overlap with the preamble or the payload of the random accessmessage. In some aspects, the uplink transmissions are disabled on oneor more carriers that are not configured with transmission occasions forthe random access message. In some aspects, uplink control informationfor the disabled uplink transmissions is multiplexed with the payload ofthe random access message.

In some aspects, a transmit power for the preamble is dynamicallyconfigured based on at least one of: a transmission occasion in whichthe preamble is to be transmitted, a carrier to be used to transmit thepreamble, a pathloss measurement for the carrier, a transmissionbandwidth assigned for transmission of the preamble, a power spectraldensity target for transmission of the preamble, a pathloss compensationfactor for transmission of the preamble, or a combination thereof. Insome aspects, a transmit power for the payload is dynamically configuredbased on at least one of: a transmission occasion in which the payloadis to be transmitted, a carrier to be used to transmit the payload, apathloss measurement for the carrier, a transmission bandwidth assignedfor transmission of the payload, a power spectral density target fortransmission of the payload, a pathloss compensation factor fortransmission of the payload, or a combination thereof. In some aspects,the QoS requirement is based at least in part on a reference signalreceived power (RSRP) parameter.

Yet another innovative aspect of the subject matter described in thisdisclosure can be implemented in a non-transitory computer-readablemedium storing one or more instructions for wireless communication. Theone or more instructions, when executed by one or more processors of aUE, may cause the one or more processors to determine a QoS requirementassociated with a payload of a random access message, where the randomaccess message includes a preamble and the payload; and transmit thepreamble and the payload based on a priority that is determined usingthe QoS requirement.

In some aspects, the priority is determined based on a determinationthat the UE is operating in a carrier aggregation mode, a dualconnectivity mode, or a supplemental uplink mode. In some aspects, thepriority relates to multiple cell groups, multiple frequency ranges, ormultiple component carriers with which the UE is configured to operate.In some aspects, the priority indicates at least one of: a cell group onwhich at least one of the preamble or the payload is to be transmitted,a component carrier on which at least one of the preamble or the payloadis to be transmitted, a transmission power with which at least one ofthe preamble or the payload is to be transmitted, or a combinationthereof.

In some aspects, the preamble and the payload are transmitted using asame cell group based on a determination that the QoS requirementsatisfies a threshold. In some aspects, the threshold is based on atleast one of a collision probability of random selection of preamble ordemodulation reference signal (DMRS) sequences, available transmissionoccasions on different uplink carriers, one or more channel qualitymeasurements, one or more interference measurements, or a combinationthereof. In some aspects, the preamble and the payload are transmittedusing different cell groups based on a determination that the QoSrequirement does not satisfy a threshold.

In some aspects, the priority is determined based on whether the randomaccess message is to be transmitted as an initial transmission or are-transmission. In some aspects, the priority is determined based on adetermination that the UE is configured with a first cell group thatuses a first frequency range and is configured with a second cell groupthat uses a second frequency range. In some aspects, the first frequencyrange is a sub-6 gigahertz frequency range and the second frequencyrange is at least one of a millimeter wave frequency range, a differentcarrier frequency within the sub-6 gigahertz frequency range that has adifferent pathloss than the first frequency range, or an unlicensedspectrum frequency range. In some aspects, the preamble and the payloadare transmitted using the first cell group based on a determination thatthe QoS requirement satisfies a threshold. In some aspects, the preambleis transmitted using the first cell group and the payload is transmittedusing the second cell group based on a determination that the QoSrequirement does not satisfy a threshold. In some aspects, the preambleand the payload are transmitted using a different cell group for a firsttransmission occasion and are transmitted using a same cell group for asecond transmission occasion.

In some aspects, the priority is determined based on a determinationthat the UE is configured with a first cell group having a higherdensity of transmission occasions or a higher peak power constraint anda second cell group having a lower density of transmission occasions ora lower peak power constraint. In some aspects, the first cell group andthe second cell group use a same frequency range. In some aspects, thepreamble and the payload are transmitted using the first cell groupbased on a determination that the QoS requirement satisfies a threshold.is the preamble is transmitted using the first cell group and thepayload is transmitted using the second cell group based on adetermination that the QoS requirement does not satisfy a threshold.

In some aspects, the preamble and the payload are transmitted using asame transmit power based on a determination that the QoS requirementsatisfies a threshold. In some aspects, the same transmit power ishigher than a transmit power used for other uplink transmissions thatoverlap with the preamble or the payload of the random access message.In some aspects, the preamble and the payload are transmitted usingdifferent transmit powers based on a determination that the QoSrequirement does not satisfy a threshold. In some aspects, the thresholdis based on at least one of a collision probability of random selectionof preamble or DMRS sequences, available transmission occasions ondifferent uplink carriers, one or more channel quality measurements, oneor more interference measurements, or a combination thereof. In someaspects, a first transmit power used for the preamble is higher than asecond transmit power used for the payload and is higher than a transmitpower used for other uplink transmissions that overlap with the preambleof the random access message.

In some aspects, the UE is configured to disable uplink transmissionsthat overlap with the preamble or the payload of the random accessmessage. In some aspects, the uplink transmissions are disabled on oneor more carriers that are not configured with transmission occasions forthe random access message. In some aspects, uplink control informationfor the disabled uplink transmissions is multiplexed with the payload ofthe random access message.

In some aspects, a transmit power for the preamble is dynamicallyconfigured based on at least one of: a transmission occasion in whichthe preamble is to be transmitted, a carrier to be used to transmit thepreamble, a pathloss measurement for the carrier, a transmissionbandwidth assigned for transmission of the preamble, a power spectraldensity target for transmission of the preamble, a pathloss compensationfactor for transmission of the preamble, or a combination thereof. Insome aspects, a transmit power for the payload is dynamically configuredbased on at least one of: a transmission occasion in which the payloadis to be transmitted, a carrier to be used to transmit the payload, apathloss measurement for the carrier, a transmission bandwidth assignedfor transmission of the payload, a power spectral density target fortransmission of the payload, a pathloss compensation factor fortransmission of the payload, or a combination thereof. In some aspects,the QoS requirement is based at least in part on a reference signalreceived power (RSRP) parameter.

Still another innovative aspect of the subject matter described in thisdisclosure can be implemented in an apparatus for wirelesscommunication. The apparatus may include means for determining a QoSrequirement associated with a payload of a random access message, wherethe random access message includes a preamble and the payload; and meansfor transmitting the preamble and the payload based on a priority thatis determined using the QoS requirement.

In some aspects, the priority is determined based on a determinationthat the apparatus is operating in a carrier aggregation mode, a dualconnectivity mode, or a supplemental uplink mode. In some aspects, thepriority relates to multiple cell groups, multiple frequency ranges, ormultiple component carriers with which the apparatus is configured tooperate. In some aspects, the priority indicates at least one of: a cellgroup on which at least one of the preamble or the payload is to betransmitted, a component carrier on which at least one of the preambleor the payload is to be transmitted, a transmission power with which atleast one of the preamble or the payload is to be transmitted, or acombination thereof.

In some aspects, the preamble and the payload are transmitted using asame cell group based on a determination that the QoS requirementsatisfies a threshold. In some aspects, the threshold is based on atleast one of a collision probability of random selection of preamble ordemodulation reference signal (DMRS) sequences, available transmissionoccasions on different uplink carriers, one or more channel qualitymeasurements, one or more interference measurements, or a combinationthereof. In some aspects, the preamble and the payload are transmittedusing different cell groups based on a determination that the QoSrequirement does not satisfy a threshold.

In some aspects, the priority is determined based on whether the randomaccess message is to be transmitted as an initial transmission or are-transmission. In some aspects, the priority is determined based on adetermination that the apparatus is configured with a first cell groupthat uses a first frequency range and is configured with a second cellgroup that uses a second frequency range. In some aspects, the firstfrequency range is a sub-6 gigahertz frequency range and the secondfrequency range is at least one of a millimeter wave frequency range, adifferent carrier frequency within the sub-6 gigahertz frequency rangethat has a different pathloss than the first frequency range, or anunlicensed spectrum frequency range. In some aspects, the preamble andthe payload are transmitted using the first cell group based on adetermination that the QoS requirement satisfies a threshold. In someaspects, the preamble is transmitted using the first cell group and thepayload is transmitted using the second cell group based on adetermination that the QoS requirement does not satisfy a threshold. Insome aspects, the preamble and the payload are transmitted using adifferent cell group for a first transmission occasion and aretransmitted using a same cell group for a second transmission occasion.

In some aspects, the priority is determined based on a determinationthat the apparatus is configured with a first cell group having a higherdensity of transmission occasions or a higher peak power constraint anda second cell group having a lower density of transmission occasions ora lower peak power constraint. In some aspects, the first cell group andthe second cell group use a same frequency range. In some aspects, thepreamble and the payload are transmitted using the first cell groupbased on a determination that the QoS requirement satisfies a threshold.is the preamble is transmitted using the first cell group and thepayload is transmitted using the second cell group based on adetermination that the QoS requirement does not satisfy a threshold.

In some aspects, the preamble and the payload are transmitted using asame transmit power based on a determination that the QoS requirementsatisfies a threshold. In some aspects, the same transmit power ishigher than a transmit power used for other uplink transmissions thatoverlap with the preamble or the payload of the random access message.In some aspects, the preamble and the payload are transmitted usingdifferent transmit powers based on a determination that the QoSrequirement does not satisfy a threshold. In some aspects, the thresholdis based on at least one of a collision probability of random selectionof preamble or DMRS sequences, available transmission occasions ondifferent uplink carriers, one or more channel quality measurements, oneor more interference measurements, or a combination thereof. In someaspects, a first transmit power used for the preamble is higher than asecond transmit power used for the payload and is higher than a transmitpower used for other uplink transmissions that overlap with the preambleof the random access message.

In some aspects, the apparatus is configured to disable uplinktransmissions that overlap with the preamble or the payload of therandom access message. In some aspects, the uplink transmissions aredisabled on one or more carriers that are not configured withtransmission occasions for the random access message. In some aspects,uplink control information for the disabled uplink transmissions ismultiplexed with the payload of the random access message.

In some aspects, a transmit power for the preamble is dynamicallyconfigured based on at least one of: a transmission occasion in whichthe preamble is to be transmitted, a carrier to be used to transmit thepreamble, a pathloss measurement for the carrier, a transmissionbandwidth assigned for transmission of the preamble, a power spectraldensity target for transmission of the preamble, a pathloss compensationfactor for transmission of the preamble, or a combination thereof. Insome aspects, a transmit power for the payload is dynamically configuredbased on at least one of: a transmission occasion in which the payloadis to be transmitted, a carrier to be used to transmit the payload, apathloss measurement for the carrier, a transmission bandwidth assignedfor transmission of the payload, a power spectral density target fortransmission of the payload, a pathloss compensation factor fortransmission of the payload, or a combination thereof. In some aspects,the QoS requirement is based at least in part on a reference signalreceived power (RSRP) parameter.

Aspects generally include a method, apparatus, system, computer programproduct, non-transitory computer-readable medium, user equipment, basestation, wireless communication device, and processing system assubstantially described herein with reference to and as illustrated bythe accompanying drawings and specification.

Details of one or more implementations of the subject matter describedin this disclosure are set forth in the accompanying drawings and thedescription below. Other features, aspects, and advantages will becomeapparent from the description, the drawings and the claims. Note thatthe relative dimensions of the following figures may not be drawn toscale.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram illustrating an example of a wireless network.

FIG. 2 is a block diagram illustrating an example of a base station incommunication with a user equipment (UE) in a wireless network.

FIG. 3 is a diagram illustrating an example of a two-step random accesschannel (RACH) procedure.

FIG. 4 is a diagram illustrating an example of a random access messagethat includes a random access message preamble and a random accessmessage payload.

FIGS. 5-7 are diagrams illustrating examples of priority handling for arandom access message that includes a preamble and a payload.

FIG. 8 is a diagram illustrating an example process performed, forexample, by a UE.

FIG. 9 is a diagram illustrating another example process performed, forexample, by a UE.

Like reference numbers and designations in the various drawings indicatelike elements.

DETAILED DESCRIPTION

The following description is directed to certain implementations for thepurposes of describing the innovative aspects of this disclosure.However, a person having ordinary skill in the art will readilyrecognize that the teachings herein can be applied in a multitude ofdifferent ways. Some of the examples in this disclosure are based onwireless and wired local area network (LAN) communication according tothe Institute of Electrical and Electronics Engineers (IEEE) 802.11wireless standards, the IEEE 802.3 Ethernet standards, and the IEEE 1901Powerline communication (PLC) standards. However, the describedimplementations may be implemented in any device, system or network thatis capable of transmitting and receiving radio frequency signalsaccording to any of the wireless communication standards, including anyof the IEEE 802.11 standards, the Bluetooth® standard, code divisionmultiple access (CDMA), frequency division multiple access (FDMA), timedivision multiple access (TDMA), Global System for Mobile communications(GSM), GSM/General Packet Radio Service (GPRS), Enhanced Data GSMEnvironment (EDGE), Terrestrial Trunked Radio (TETRA), Wideband-CDMA(W-CDMA), Evolution Data Optimized (EV-DO), 1×EV-DO, EV-DO Rev A, EV-DORev B, High Speed Packet Access (HSPA), High Speed Downlink PacketAccess (HSDPA), High Speed Uplink Packet Access (HSUPA), Evolved HighSpeed Packet Access (HSPA+), Long Term Evolution (LTE), AMPS, or otherknown signals that are used to communicate within a wireless, cellularor internet of things (IOT) network, such as a system utilizing 3G, 4Gor 5G, or further implementations thereof, technology.

Some techniques and apparatuses described herein assist a user equipment(UE) with balancing quality of service (QoS) requirements (such asaccess latency or reliability requirements) and consumption of highpriority network resources (such as for load balancing) whentransmitting a random access message (RAM) in a two-step random accesschannel (RACH) procedure. As a result, the UE may be capable ofsatisfying QoS requirements for the RAM while reducing an impact oftransmission of the RAM on other uplink transmissions. Furthermore, sometechniques and apparatuses described herein assist a UE withprioritizing portions of the RAM in different UE operating modes, suchas a dual connectivity mode, a carrier aggregation mode, or asupplemental uplink mode. Some techniques and apparatuses describedherein employ cross-carrier scheduling, dynamic power sharing, ordynamic power control to achieve these and other performanceimprovements.

Particular implementations of the subject matter described in thisdisclosure can be implemented to realize one or more of the followingpotential advantages. For example, this disclosure may assist a userequipment (UE) with balancing quality of service (QoS) requirements(such as access latency or reliability requirements) and consumption ofhigh priority network resources (such as for load balancing) whentransmitting a random access message (RAM) in a two-step random accesschannel (RACH) procedure. As a result, the UE may be capable ofsatisfying QoS requirements for the RAM while reducing an impact oftransmission of the RAM on other uplink transmissions. Furthermore, sometechniques and apparatuses described herein assist a UE withprioritizing portions of the RAM in different UE operating modes, suchas a dual connectivity mode, a carrier aggregation mode, or asupplemental uplink mode. Some techniques and apparatuses describedherein employ cross-carrier scheduling, dynamic power sharing, ordynamic power control to achieve these and other performanceimprovements. Furthermore, some techniques and apparatuses describedherein may enable load balancing of RAMs having different priorities.Furthermore, some techniques and apparatuses described herein may enableco-existence between UEs having different capabilities, such as apremium UE and a reduced capability UE, among other examples.Furthermore, some techniques and apparatuses described herein may enablecoverage enhancement for UEs located at a cell edge, such as bycontrolling a transmit power for RAM transmission.

FIG. 1 is a block diagram illustrating an example of a wireless network100. The wireless network 100 may be an LTE network or some otherwireless network, such as a 5G or NR network. Wireless network 100 mayinclude a number of BSs 110 (shown as BS 110 a, BS 110 b, BS 110 c, andBS 110 d) and other network entities. A BS is an entity thatcommunicates with user equipment (UEs) and also may be referred to as abase station, a NR BS, a Node B, a gNB, a 5G node B (NB), an accesspoint, a transmit receive point (TRP), or the like. Each BS may providecommunication coverage for a particular geographic area. In 3GPP, theterm “cell” can refer to a coverage area of a BS, a BS subsystem servingthis coverage area, or a combination thereof, depending on the contextin which the term is used.

A BS may provide communication coverage for a macro cell, a pico cell, afemto cell, another type of cell, or a combination thereof. A macro cellmay cover a relatively large geographic area (for example, severalkilometers in radius) and may allow unrestricted access by UEs withservice subscription. A pico cell may cover a relatively smallgeographic area and may allow unrestricted access by UEs with servicesubscription. A femto cell may cover a relatively small geographic area(for example, a home) and may allow restricted access by UEs havingassociation with the femto cell (for example, UEs in a closed subscribergroup (CSG)). A BS for a macro cell may be referred to as a macro BS.ABS for a pico cell may be referred to as a pico BS. A BS for a femtocell may be referred to as a femto BS or a home BS. In the example shownin FIG. 1, a BS 110 a may be a macro BS for a macro cell 102 a, a BS 110b may be a pico BS for a pico cell 102 b, and a BS 110 c may be a femtoBS for a femto cell 102 c. A BS may support one or multiple (forexample, three) cells. The terms “eNB”, “base station”, “NR BS”, “gNB”,“TRP”, “AP”, “node B”, “5G NB”, and “cell” may be used interchangeablyherein.

In some examples, a cell may not necessarily be stationary, and thegeographic area of the cell may move according to the location of amobile BS. In some examples, the BSs may be interconnected to oneanother as well as to one or more other BSs or network nodes (not shown)in the wireless network 100 through various types of backhaulinterfaces, such as a direct physical connection, a virtual network, ora combination thereof using any suitable transport network.

Wireless network 100 also may include relay stations. A relay station isan entity that can receive a transmission of data from an upstreamstation (for example, a BS or a UE) and send a transmission of the datato a downstream station (for example, a UE or a BS). A relay stationalso may be a UE that can relay transmissions for other UEs. In theexample shown in FIG. 1, a relay station 110 d may communicate withmacro BS 110 a and a UE 120 d in order to facilitate communicationbetween BS 110 a and UE 120 d. A relay station also may be referred toas a relay BS, a relay base station, a relay, etc.

Wireless network 100 may be a heterogeneous network that includes BSs ofdifferent types, for example, macro BSs, pico BSs, femto BSs, relay BSs,etc. These different types of BSs may have different transmit powerlevels, different coverage areas, and different impacts on interferencein wireless network 100. For example, macro BSs may have a high transmitpower level (for example, 5 to 40 Watts) whereas pico BSs, femto BSs,and relay BSs may have lower transmit power levels (for example, 0.1 to2 Watts).

A network controller 130 may couple to a set of BSs and may providecoordination and control for these BSs. Network controller 130 maycommunicate with the BSs via a backhaul. The BSs also may communicatewith one another, for example, directly or indirectly via a wireless orwireline backhaul.

UEs 120 (for example, 120 a, 120 b, 120 c) may be dispersed throughoutwireless network 100, and each UE may be stationary or mobile. A UE alsomay be referred to as an access terminal, a terminal, a mobile station,a subscriber unit, a station, etc. A UE may be a cellular phone (forexample, a smart phone), a personal digital assistant (PDA), a wirelessmodem, a wireless communication device, a handheld device, a laptopcomputer, a cordless phone, a wireless local loop (WLL) station, atablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook,a medical device or equipment, biometric sensors/devices, wearabledevices (smart watches, smart clothing, smart glasses, smart wristbands, smart jewelry (for example, smart ring, smart bracelet)), anentertainment device (for example, a music or video device, or asatellite radio), a vehicular component or sensor, smart meters/sensors,industrial manufacturing equipment, a global positioning system device,or any other suitable device that is configured to communicate via awireless or wired medium.

Some UEs may be considered machine-type communication (MTC) or evolvedor enhanced machine-type communication (eMTC) UEs. MTC and eMTC UEsinclude, for example, robots, drones, remote devices, sensors, meters,monitors, location tags, etc., that may communicate with a base station,another device (for example, remote device), or some other entity. Awireless node may provide, for example, connectivity for or to a network(for example, a wide area network such as Internet or a cellularnetwork) via a wired or wireless communication link. Some UEs may beconsidered Internet-of-Things (IoT) devices or may be implemented asNB-IoT (narrowband internet of things) devices. Some UEs may beconsidered a Customer Premises Equipment (CPE). UE 120 may be includedinside a housing that houses components of UE 120, such as processorcomponents, memory components, similar components, or a combinationthereof.

In general, any number of wireless networks may be deployed in a givengeographic area. Each wireless network may support a particular RAT andmay operate on one or more frequencies. A RAT also may be referred to asa radio technology, an air interface, etc. A frequency also may bereferred to as a carrier, a frequency channel, etc. Each frequency maysupport a single RAT in a given geographic area in order to avoidinterference between wireless networks of different RATs. In some cases,NR or 5G RAT networks may be deployed.

In some examples, access to the air interface may be scheduled, where ascheduling entity (for example, a base station) allocates resources forcommunication among some or all devices and equipment within thescheduling entity's service area or cell. Within the present disclosure,as discussed further below, the scheduling entity may be responsible forscheduling, assigning, reconfiguring, and releasing resources for one ormore subordinate entities. That is, for scheduled communication,subordinate entities utilize resources allocated by the schedulingentity.

Base stations are not the only entities that may function as ascheduling entity. That is, in some examples, a UE may function as ascheduling entity, scheduling resources for one or more subordinateentities (for example, one or more other UEs). In this example, the UEis functioning as a scheduling entity, and other UEs utilize resourcesscheduled by the UE for wireless communication. A UE may function as ascheduling entity in a peer-to-peer (P2P) network, in a mesh network, oranother type of network. In a mesh network example, UEs may optionallycommunicate directly with one another in addition to communicating withthe scheduling entity.

Thus, in a wireless communication network with a scheduled access totime-frequency resources and having a cellular configuration, a P2Pconfiguration, and a mesh configuration, a scheduling entity and one ormore subordinate entities may communicate utilizing the scheduledresources.

In some aspects, two or more UEs 120 (for example, shown as UE 120 a andUE 120 e) may communicate directly using one or more sidelink channels(for example, without using a base station 110 as an intermediary tocommunicate with one another). For example, the UEs 120 may communicateusing peer-to-peer (P2P) communications, device-to-device (D2D)communications, a vehicle-to-everything (V2X) protocol (which mayinclude a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure(V2I) protocol, or similar protocol), a mesh network, or similarnetworks, or combinations thereof. In this case, the UE 120 may performscheduling operations, resource selection operations, as well as otheroperations described elsewhere herein as being performed by the basestation 110.

FIG. 2 is a block diagram illustrating an example 200 of a base station110 in communication with a UE 120. In some aspects, base station 110and UE 120 may respectively be one of the base stations and one of theUEs in wireless network 100 of FIG. 1. Base station 110 may be equippedwith T antennas 234 a through 234 t, and UE 120 may be equipped with Rantennas 252 a through 252 r, where in general T≥1 and R≥1.

At base station 110, a transmit processor 220 may receive data from adata source 212 for one or more UEs, select one or more modulation andcoding schemes (MCS) for each UE based on channel quality indicators(CQIs) received from the UE, process (for example, encode and modulate)the data for each UE based on the MCS(s) selected for the UE, andprovide data symbols for all UEs. The transmit processor 220 also mayprocess system information (for example, for semi-static resourcepartitioning information (SRPI), etc.) and control information (forexample, CQI requests, grants, upper layer signaling, etc.) and provideoverhead symbols and control symbols. The transmit processor 220 alsomay generate reference symbols for reference signals (for example, thecell-specific reference signal (CRS)) and synchronization signals (forexample, the primary synchronization signal (PSS) and secondarysynchronization signal (SSS)). A transmit (TX) multiple-inputmultiple-output (MIMO) processor 230 may perform spatial processing (forexample, precoding) on the data symbols, the control symbols, theoverhead symbols, or the reference symbols, if applicable, and mayprovide T output symbol streams to T modulators (MODs) 232 a through 232t. Each modulator 232 may process a respective output symbol stream (forexample, for OFDM, etc.) to obtain an output sample stream. Eachmodulator 232 may further process (for example, convert to analog,amplify, filter, and upconvert) the output sample stream to obtain adownlink signal. T downlink signals from modulators 232 a through 232 tmay be transmitted via T antennas 234 a through 234 t, respectively.According to various aspects described in more detail below, thesynchronization signals can be generated with location encoding toconvey additional information.

At UE 120, antennas 252 a through 252 r may receive the downlink signalsfrom base station 110 or other base stations and may provide receivedsignals to demodulators (DEMODs) 254 a through 254 r, respectively. Eachdemodulator 254 may condition (for example, filter, amplify,downconvert, and digitize) a received signal to obtain input samples.Each demodulator 254 may further process the input samples (for example,for OFDM, etc.) to obtain received symbols. A MIMO detector 256 mayobtain received symbols from all R demodulators 254 a through 254 r,perform MIMO detection on the received symbols if applicable, andprovide detected symbols. A receive processor 258 may process (forexample, demodulate and decode) the detected symbols, provide decodeddata for UE 120 to a data sink 260, and provide decoded controlinformation and system information to a controller or processor(controller/processor) 280. A channel processor may determine referencesignal received power (RSRP), received signal strength indicator (RSSI),reference signal received quality (RSRQ), channel quality indicator(CQI), etc. In some aspects, one or more components of UE 120 may beincluded in a housing.

On the uplink, at UE 120, a transmit processor 264 may receive andprocess data from a data source 262 and control information (forexample, for reports including RSRP, RSSI, RSRQ, CQI, etc.) fromcontroller/processor 280. Transmit processor 264 also may generatereference symbols for one or more reference signals. The symbols fromtransmit processor 264 may be precoded by a TX MIMO processor 266 ifapplicable, further processed by modulators 254 a through 254 r (forexample, for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to base station110. At base station 110, the uplink signals from UE 120 and other UEsmay be received by antennas 234, processed by demodulators 232, detectedby a MIMO detector 236 if applicable, and further processed by a receiveprocessor 238 to obtain decoded data and control information sent by UE120. Receive processor 238 may provide the decoded data to a data sink239 and the decoded control information to a controller or processor(i.e., controller/processor) 240. The base station 110 may includecommunication unit 244 and communicate to network controller 130 viacommunication unit 244. The network controller 130 may includecommunication unit 294, a controller or processor (i.e.,controller/processor) 290, and memory 292.

Controller/processor 240 of base station 110, controller/processor 280of UE 120, or any other component(s) of FIG. 2 may perform one or moretechniques associated with priority handling for a random access messagethat includes a preamble and a payload, as described in more detailelsewhere herein. For example, controller/processor 240 of base station110, controller/processor 280 of UE 120, or any other component(s) (orcombinations of components) of FIG. 2 may perform or direct operationsof, for example, process 800 of FIG. 8, process 900 of FIG. 9, or otherprocesses as described herein. Memories 242 and 282 may store data andprogram codes for base station 110 and UE 120, respectively. A scheduler246 may schedule UEs for data transmission on the downlink, the uplink,or a combination thereof.

The stored program codes, when executed by controller/processor 280 orother processors and modules at UE 120, may cause the UE 120 to performoperations described with respect to process 800 of FIG. 8, process 900of FIG. 9, or other processes as described herein. A scheduler 246 mayschedule UEs for data transmission on the downlink, the uplink, or acombination thereof.

In some aspects, UE 120 may include means for determining a QoSrequirement associated with a payload of a random access message thatincludes a preamble and the payload, means for transmitting the preambleand the payload based on a priority that is determined using the QoSrequirement, or the like, or combinations thereof. In some aspects, suchmeans may include one or more components of UE 120 described inconnection with FIG. 2.

In some aspects, UE 120 may include means for determining a firsttransmit power for transmission of a preamble of a random access messagebased at least in part on a first set of parameters; means fordetermining a second transmit power for transmission of a payload of therandom access message based at least in part on a second set ofparameters, where the random access message includes both the preambleand the payload; means for transmitting the preamble using the firsttransmit power; means for transmitting the payload using the secondtransmit power; or the like. In some aspects, such means may include oneor more components of UE 120 described in connection with FIG. 2.

While blocks in FIG. 2 are illustrated as distinct components, thefunctions described above with respect to the blocks may be implementedin a single hardware, software, or combination component or in variouscombinations of components. For example, the functions described withrespect to the transmit processor 264, the receive processor 258, the TXMIMO processor 266, or another processor may be performed by or underthe control of controller/processor 280.

FIG. 3 is a diagram illustrating an example 300 of a two-step randomaccess channel procedure. As shown in FIG. 3, a base station 110 and aUE 120 may communicate with one another to perform the two-step randomaccess channel (RACH) procedure.

In a first operation 305, the base station 110 may transmit, and the UE120 may receive, one or more synchronization signal blocks (SSBs),system information blocks (SIBs), or reference signals (RSs). In asecond operation 310, the UE 120 may perform downlink (DL)synchronization (such as by using one or more SSBs), may decode systeminformation (SI) that is included in one or more SIBs, or may performone or more measurements of the RS(s). Based on performing the secondoperation 310, the UE 120 may determine parameters for transmitting arandom access message (RAM) in the two-step RACH procedure. For example,the UE 120 may determine one or more physical random access channel(PRACH) transmission parameters to be used to transmit the RAM, maydetermine one or more parameters for generating a preamble of the RAM,may identify one or more uplink resources on which the RAM is to betransmitted, or the like.

In a third operation 315, the UE 120 may transmit a RAM preamble. In afourth operation 320, the UE 120 may transmit a RAM payload. As shown,the UE 120 may transmit the RAM preamble and the RAM payload as part ofa first step of the two-step RACH procedure. The RAM is sometimesreferred to as message A, msgA, or a first message in a two-step RACHprocedure. The RAM preamble is sometimes referred to as a message Apreamble, a msgA preamble, or a preamble. The RAM payload is sometimesreferred to as a message A payload, a msgA payload, or a payload. TheRAM may include some or all of the contents of message 1 (msg1) andmessage 3 (msg3) of a four-step RACH procedure. For example, the RAMpreamble may include some or all contents of message 1 (such as a RACHpreamble). The RAM payload may include some or all contents of message 3(such as a UE identifier, uplink control information, or the like).

In a fourth operation 325, the base station 110 may receive the RAMpreamble transmitted by the UE 120. If the base station 110 successfullyreceives and decodes the RAM preamble, the base station 110 may thenreceive and decode the RAM payload. In a fifth operation 330, the basestation 110 may transmit a random access response (RAR) message. Asshown, the base station 110 may transmit the RAR message as part of asecond step of the two-step RACH procedure. The RAR message is sometimesreferred to as message B, msgB, or a second message in a two-step RACHprocedure. The RAR message may include some or all of the contents ofmessage 2 (msg2) and message 4 (msg4) of a four-step RACH procedure. Forexample, the RAR message may include the detected RACH preambleidentifier, the detected UE identifier, a timing advance value,contention resolution information, or the like.

FIG. 4 is a diagram illustrating an example 400 of a random accessmessage that includes a random access message preamble and a randomaccess message payload. As shown, the RAM of the two-step RACH proceduremay include a RAM preamble and a RAM payload, as described above. TheRAM preamble may include a PRACH preamble signal and a guard time (shownas GT, with a duration of T_(G)). The RAM payload may include ademodulation reference signal (DMRS) or a physical uplink shared channel(PUSCH) communication, as well as a guard time (also shown as GT, with aduration of T_(G)). As further shown, transmission of the RAM preambleand transmission of the RAM payload may be separated in time by atransmission guard time (shown as TxG, with a duration of T_(g)).

In a four-step RACH procedure, a UE 120 always transmits message 1(corresponding to the RAM preamble) with a higher priority than message3 (corresponding to the RAM payload). However, in an NR RAT, a two-stepRACH procedure may be used in a variety of scenarios with differentquality of service (QoS) requirements for the RAM payload or differentconnection states of the UE 120 (such as a radio resource control (RRC)connected state, an RRC active state, or an RRC idle state). Due to thevariety of scenarios in which the two-step RACH procedure may be used,the UE 120 may obtain performance benefits by treating differentportions of the combined RAM (such as a RAM preamble portion and a RAMpayload portion) with the same priority in some scenarios and differentpriorities in other scenarios.

For example, when the UE 120 is in an RRC active state or an RRC idlestate, the RAM payload may include an RRC connection request, an RRCresumption request, or an RRC re-establishment request. These types ofrequests may have a small payload and may be associated with a high QoSrequirement, such as a low latency requirement, a high reliabilityrequirement, or the like. The UE 120 may assist with satisfying the highQoS requirement of the RAM payload by treating the RAM payload with thesame high priority as the RAM preamble (whereas the RAM preamble ormessage 1 would normally always be treated with a higher priority thanthe RAM payload or message 3). Thus, the UE 120 may improve reliabilityor reduce latency for high priority RAM payloads. Furthermore, since theRAM payload tends to be small in these scenarios, the impact on thenetwork as a result of prioritizing this type of RAM payload is minimal(such as consumption of higher priority network resources that could beused for other transmissions).

As another example, when the UE 120 is in an RRC connected state, theRAM payload may include user plane or control plane information. Thisinformation may have a large payload and may be associated with a lowerQoS requirement, such as a relaxed (high) latency requirement, a relaxed(low) reliability requirement, or the like. The UE 120 may assist withsatisfying the lower QoS requirement while permitting higher prioritynetwork resources to be available for other transmissions by treatingthe RAM payload with a lower priority than the RAM preamble.

In some cases, the UE 120 may operate using multiple cell groups ormultiple frequency ranges (such as in a dual connectivity mode) or mayoperate using multiple component carriers (such as in a carrieraggregation mode or a supplemental uplink mode). The different cellgroups, frequency ranges, or component carriers may have differentcharacteristics or configurations that lead to different reliabilitiesor different latencies for transmissions. The UE 120 may take thesecharacteristics or configurations into account when determining how totransmit the RAM preamble and the RAM payload in different scenarios(such as when the RAM preamble and the RAM payload are treated with thesame priority or different priorities).

FIG. 5 is a diagram illustrating an example 500 of priority handling fora random access message that includes a preamble and a payload. As shownin FIG. 5, a base station 110 and a UE 120 may communicate with oneanother to perform the two-step RACH procedure. As part of the two-stepRACH procedure, the UE 120 may transmit a RAM, including a RAM preambleand a RAM payload, to the base station 110.

In a first operation 505, the UE 120 may determine a QoS requirement fora RAM payload of the RAM. As described above, in some cases the RAMpayload may have a relatively high QoS requirement (that satisfies athreshold), such as a low latency requirement (that is less than orequal to a threshold), a high reliability requirement (that is greaterthan or equal to a threshold), or the like. For example, the RAM payloadmay have a relatively high QoS requirement when the UE 120 transmits theRAM in an RRC active state or an RRC idle state. Additionally, oralternatively, the RAM payload may have a relatively high QoSrequirement when the RAM payload includes an RRC connection request, anRRC resumption request, or an RRC re-establishment request.

As also described above, in some cases the RAM payload may have arelatively low QoS requirement (that does not satisfy a threshold), suchas a high latency requirement (that is greater than or equal to athreshold), a low reliability requirement (that is less than or equal toa threshold), or the like. For example, the RAM payload may have arelatively low QoS requirement when the UE 120 transmits the RAM in anRRC connected state. Additionally, or alternatively, the RAM payload mayhave a relatively low QoS requirement when the RAM payload includes userplane information or control plane information. In some aspects, the UE120 may determine a QoS requirement for the RAM payload based on an RRCstate of the UE. Additionally, or alternatively, the UE 120 maydetermine a QoS requirement for the RAM payload based on contents to betransmitted in the RAM payload.

In some aspects, the RAM payload may have a relatively low QoSrequirement when the RAM transmission is an initial transmission.Conversely, the RAM payload may have a relatively high QoS requirementwhen the RAM transmission is a re-transmission (such as after a failedtransmission of the RAM where a RAR message is not successfully receivedby the UE 120). In some aspects, a determination of the QoS requirementdepending on whether the RAM transmission is an initial transmission ora re-transmission may be independent of contents of the RAM or an RRCstate of the UE 120 at a time when the RAM is transmitted.

In a second operation 510, the UE 120 may determine a priority for theRAM based on the QoS requirement of the RAM payload. For example, the UE120 may determine a priority for the RAM payload. The priority mayindicate whether the RAM payload is to be treated with the same priorityor with a different priority (such as a lower priority) than the RAMpreamble included in the RAM. In some aspects, the UE 120 may determinethe priority based on a determination that the UE 120 is operating in adual connectivity mode (such as a dual connectivity mode that uses cellgroups on two RATs or a dual connectivity mode that uses multiple cellgroups on a single RAT), a carrier aggregation mode, or a supplementaluplink mode. In the dual connectivity mode, the UE 120 may communicateusing multiple cell groups or multiple frequency ranges. In this mode,the priority may relate to whether to transmit the RAM preamble and theRAM payload using the same cell group or the same frequency range, orwhether to transmit the RAM preamble and the RAM payload using differentcell groups or different frequency ranges. Thus, the priority mayindicate a cell group or a frequency range to be used to transmit theRAM preamble or the RAM payload.

When the UE 120 is operating in a dual connectivity mode, the UE 120 mayoperate using a first cell group and a second cell group. The first cellgroup may be associated with better performance than the second cellgroup. For example, the first cell group may be a master cell group(MCG) and the second cell group may be a secondary cell group (SCG).Additionally, or alternatively, the first cell group may use a firstfrequency range that is more reliable than a second frequency range usedfor the second cell group. In some aspects, the first frequency rangemay be an FR1 frequency range, such as a sub-6 gigahertz (GHz) frequencyrange. The second frequency range may be an FR2 frequency range (such asa millimeter wave frequency range), may be an unlicensed spectrumfrequency range, or may be a different carrier frequency within thesub-6 gigahertz frequency range that has a different pathlosscharacteristic (such as a higher pathloss) than the first frequencyrange.

In a third operation 515, the UE 120 may determine to treat the RAMpayload with a high priority when the RAM payload has a high QoSrequirement (such as a more stringent QoS requirement or a QoSrequirement that satisfies a threshold or a condition). In this case,the UE 120 may treat the RAM payload and the RAM preamble with a samepriority. For example, the UE 120 may determine to transmit the RAMpreamble and the RAM payload using the same cell group and,consequently, using the same frequency range. For example, the UE 120may transmit the RAM preamble and the RAM payload using an MCG or usingFR1, thereby prioritizing transmission of the RAM preamble and the RAMpayload as compared to transmitting using the SCG or using FR2.

As an alternative to the third operation 515, in a fourth operation 520,the UE 120 may determine to treat the RAM payload with a low prioritywhen the RAM payload has a low QoS requirement (such as a less stringentQoS requirement or a QoS requirement that does not satisfy a thresholdor a condition). In this case, the UE 120 may treat the RAM payload andthe RAM preamble with different priorities. For example, the UE 120 maytreat the RAM payload with a lower priority than the RAM preamble. Forexample, the UE 120 may determine to transmit the RAM preamble and theRAM payload using different cell group, which may result in transmissionof the RAM preamble and the RAM payload using different frequency ranges(such as when the different cell groups are configured with differentfrequency range). For example, the UE 120 may transmit the RAM preambleusing an MCG or using FR1, and may transmit the RAM payload using an SCGor using FR2, thereby prioritizing transmission of the RAM preamble overtransmission of the RAM payload.

In some aspects, when the UE 120 determines to treat the RAM payloadwith a low priority based on a QoS requirement, the UE 120 may determineto treat the RAM payload with the low priority for an initialtransmission of the RAM payload, but may treat the RAM payload with ahigh priority for a re-transmission. In this case, the UE 120 maytransmit the RAM preamble and the RAM payload using different priorities(for example, using different cell groups or different frequency ranges)for a first transmission occasion associated with the initialtransmission. The UE 120 may later transmit the RAM preamble and the RAMpayload using the same priority (for example, using the same cell groupor the same frequency range) for a second transmission occasionassociated with the re-transmission.

In some aspects, the UE 120 may configure the threshold (sometimesreferred to as a QoS threshold) or the condition (sometimes referred toas a QoS condition) to which the QoS requirement is to be compared. Forexample, the UE 120 may determine a QoS level capable of being supportedby a cell group, a frequency range, a component carrier, or the like. Ifthe QoS level of a cell group, frequency range, or component carrier iscapable of satisfying a QoS requirement for the RAM payload, then the UE120 may use that cell group, frequency range, or component carrier totransmit the RAM payload. However, if the QoS level is not capable ofsatisfying the QoS requirement for the RAM payload, then the UE 120 maytransmit the RAM payload using a higher priority cell group, frequencyrange, or component carrier (associated with a higher QoS level, forexample).

The UE 120 may determine the QoS level based on, for example, acollision probability determined for the RAM payload. The collisionprobability may be based on, for example, an available pool of RAMpreamble sequences or DMRS sequences from which the UE 120 may randomlyselect a RAM preamble sequence or a DMRS sequence. Additionally, oralternatively, the UE 120 may determine the QoS level for a componentcarrier (CC) based on available transmission occasions on that CC, whichmay be based on a number of transmission occasions on that CC (such asin a time period), a density of transmission occasions on that CC, aperiodicity of transmission occasions on that CC, or the like.Additionally, or alternatively, the UE 120 may determine the QoS levelbased on one or more channel quality measurements, such as a referencesignal received power (RSRP) measurement, a reference signal receivedquality (RSRQ) measurement, or the like. Additionally, or alternatively,the UE 120 may determine the QoS level based on one or more interferencemeasurements, such as for inter-cell interference or intra-cellinterference. In some aspects, the UE 120 may determine the QoS levelbased on one or more downlink measurements (such as an SSB measurementor an RS measurement) or based on system information (which may beobtained as described above in connection with operation 305 of FIG. 3).

In a fifth operation 525, the UE 120 may transmit the RAM preamble andthe RAM payload based on the determined priority (which is determinedbased on one or more QoS requirements of the RAM payload). For example,as described above, the UE 120 may transmit the RAM preamble and the RAMpayload using the same cell group or the same frequency range when theRAM payload is associated with a high priority (which may be due to ahigh QoS requirement or a re-transmission of the RAM payload).Alternatively, as described above, the UE 120 may transmit the RAMpreamble and the RAM payload using different cell groups or differentfrequency ranges when the RAM payload is associated with a low priority(which may be due to a low QoS requirement or an initial transmission ofthe RAM payload).

By balancing QoS requirements and consumption of high priority networkresources when transmitting a RAM in a two-step RACH procedure, the UE120 may be capable of reducing latency or increasing reliability of theRAM transmission while reducing an impact of transmission of the RAM onother uplink transmissions when appropriate.

FIG. 6 is a diagram illustrating an example 600 of priority handling fora random access message that includes a preamble and a payload. FIG. 6shows priority handling of the RAM within the two-step RACH procedure ina different scenario than that described above in connection with FIG.5. In some aspects, the UE 120 may apply the techniques described inconnection with FIG. 6 independent of or in combination with thetechniques described above in connection with FIG. 5. As indicated abovein connection with operation 510 of FIG. 5, the UE 120 may determine apriority for the RAM based on the QoS requirement of the RAM payload.

In some aspects, the UE 120 may determine the priority based on adetermination that the UE 120 is operating in a carrier aggregation mode(with multiple paired uplink and downlink CCs) or a supplemental uplinkmode (with a single downlink CC and two or more uplink CCs). In thesemodes, the UE 120 may communicate using multiple cell groups or multipleCCs, and the priority may relate to whether to transmit the RAM preambleand the RAM payload using the same cell group or the same CC, or whetherto transmit the RAM preamble and the RAM payload using different cellgroups or different CCs. Thus, the priority may indicate a cell group ora CC to be used to transmit the RAM preamble or the RAM payload.

When the UE 120 is operating in a carrier aggregation mode or asupplemental uplink mode, the UE 120 may operate using a first CC (suchas a first uplink CC, which may be included in a first set of uplink CCsin a first cell group) and a second CC (such as a second uplink CC,which may be included in a second set of uplink CCs in a second cellgroup). The first CC may be associated with better performance than thesecond CC for RAM transmissions. For example, the first CC may have ahigher density of transmission occasions for the RAM (sometimes referredto as RAM transmission occasions) as compared to the second CC, as shownat 605 in FIG. 6. A density of RAM transmission occasions may refer to anumber of RAM transmission occasions in a particular time period, whichmay be affected by a number of resource blocks (RBs) available for RAMtransmission occasions (with a larger number of RBs resulting in ahigher density), a time periodicity of RAM transmission occasions (witha shorter periodicity resulting in a higher density), a frequencydistribution of RAM transmission occasions, or the like. In someaspects, the first CC and the second CC may use a same frequency range(for example, both CCs may use FR1 or both CCs may use FR2).

In a first operation 610, the UE 120 may determine to treat the RAMpayload with a high priority when the RAM payload has a high QoSrequirement, as described above in connection with FIG. 5. In this case,the UE 120 may treat the RAM payload and the RAM preamble with a samepriority. For example, the UE 120 may determine to transmit the RAMpreamble and the RAM payload using the same CC and, consequently, usingthe same cell group. For example, the UE 120 may transmit the RAMpreamble and the RAM payload using a first CC with a higher density oftransmission occasions as compared to a second CC, thereby prioritizingtransmission of the RAM preamble and the RAM payload as compared totransmitting using the second CC.

As an alternative to the first operation 610, in a second operation 615,the UE 120 may determine to treat the RAM payload with a low prioritywhen the RAM payload has a low QoS requirement, as described above inconnection with FIG. 5. In this case, the UE 120 may treat the RAMpayload and the RAM preamble with different priorities. For example, theUE 120 may treat the RAM payload with a lower priority than the RAMpreamble. For example, the UE 120 may determine to transmit the RAMpreamble and the RAM payload using different CCs, which may result intransmission of the RAM preamble and the RAM payload using differentcell groups (such as when the different CCs are included in differentcell groups). For example, the UE 120 may transmit the RAM preambleusing a first CC with a higher density of transmission occasions ascompared to a second CC, and may transmit the RAM payload using thesecond CC, thereby prioritizing transmission of the RAM preamble overtransmission of the RAM payload.

By balancing QoS requirements and consumption of high priority networkresources when transmitting a RAM in a two-step RACH procedure, the UE120 may be capable of reducing latency or increasing reliability of theRAM transmission while reducing an impact of transmission of the RAM onother uplink transmissions when appropriate.

FIG. 7 is a diagram illustrating an example 700 of priority handling fora random access message that includes a preamble and a payload. FIG. 7shows priority handling of the RAM within the two-step RACH procedure ina different scenario than that described above in connection with FIG. 5and FIG. 6. In some aspects, the UE 120 may apply the techniquesdescribed in connection with FIG. 7 independent of or in combinationwith the techniques described above in connection with FIG. 5 or FIG. 6.As indicated above in connection with operation 510 of FIG. 5, the UE120 may determine a priority for the RAM based on the QoS requirement ofthe RAM payload.

In some aspects, the UE 120 may determine the priority based on adetermination that the UE 120 is operating in a carrier aggregation mode(with multiple paired uplink and downlink CCs) or a supplemental uplinkmode (with a single downlink CC and two or more uplink CCs), asdescribed above in connection with FIG. 6. When the UE 120 is operatingin a carrier aggregation mode or a supplemental uplink mode, the UE 120may operate using a first CC and a second CC. The first CC may beassociated with better performance than the second CC for RAMtransmissions. For example, as shown at 705, the first CC may have ahigher peak power constraint, shown as P₁, as compared to the second CC(which may have a lower peak power constraint, shown as P₂), whichpermits a transmission or multiple concurrent transmissions on the firstCC to use a higher transmit power than the second CC. In some aspects,the first CC and the second CC may use a same frequency range.

In a first operation 710, the UE 120 may determine to treat the RAMpayload with a high priority when the RAM payload has a high QoSrequirement, as described above in connection with FIG. 5. In this case,the UE 120 may treat the RAM payload and the RAM preamble with a samepriority. For example, the UE 120 may determine to transmit the RAMpreamble and the RAM payload using the same CC and, consequently usingthe same cell group. For example, the UE 120 may transmit the RAMpreamble and the RAM payload using a first CC with a higher peak powerconstraint as compared to a second CC, thereby prioritizing transmissionof the RAM preamble and the RAM payload as compared to transmittingusing the second CC.

As an alternative to the first operation 710, in a second operation 715,the UE 120 may determine to treat the RAM payload with a low prioritywhen the RAM payload has a low QoS requirement, as described above inconnection with FIG. 5. In this case, the UE 120 may treat the RAMpayload and the RAM preamble with different priorities. For example, theUE 120 may treat the RAM payload with a lower priority than the RAMpreamble. For example, the UE 120 may determine to transmit the RAMpreamble and the RAM payload using different CCs, which may result intransmission of the RAM preamble and the RAM payload using differentcell groups (such as when the different CCs are included in differentcell groups). For example, the UE 120 may transmit the RAM preambleusing a first CC with a higher peak power constraint as compared to asecond CC, and may transmit the RAM payload using the second CC with alower peak power constraint, thereby prioritizing transmission of theRAM preamble over transmission of the RAM payload.

In a third operation 720, the UE 120 may transmit the RAM preamble andthe RAM payload using the same transmit power when the UE 120 determinesto transmit the RAM preamble and the RAM payload with the same priority.As further shown, the transmit power used to transmit the RAM preambleand the RAM payload may be higher than a transmit power used for otheruplink transmissions that occur in parallel with the RAM transmission(for example, other uplink transmissions that overlap with or areconcurrent with the RAM preamble or the RAM payload, such as a soundingreference signal (SRS), a physical uplink control channel (PUCCH)communication, a physical uplink shared channel (PUSCH) transmission, orthe like). In this way, the UE 120 may prioritize transmission of theRAM preamble and the RAM payload over other uplink transmissions thatoverlap with the RAM.

In some aspects, as shown by a fourth operation 725, the UE 120 maydisable uplink transmissions that occur in parallel with the RAMtransmission. As shown, the UE 120 may disable those parallel uplinktransmissions when the RAM preamble and the RAM payload are transmittedwith the same priority (for example, the same transmit power).Alternatively, the UE 120 may disable those parallel uplinktransmissions when the RAM preamble and the RAM payload are transmittedwith different priorities (for example, different transmit powers). Insome aspects, the UE 120 may disable parallel uplink transmissions onone or more carriers via which the RAM is not transmitted or on one ormore carriers that are not configured with transmission occasions forthe RAM. As further shown, in some aspects, the UE 120 may multiplexuplink control information (UCI) for the disabled uplink transmissionswith the RAM payload. In this way, the RAM may be prioritized over theparallel uplink transmissions while still transmitting the UCI thatwould otherwise be dropped by disabling the parallel uplinktransmissions.

In a fifth operation 730, the UE 120 may transmit the RAM preamble andthe RAM payload using different transmit powers when the UE 120determines to transmit the RAM preamble and the RAM payload withdifferent priorities. In this case, the UE 120 may transmit the RAMpreamble with a higher transmit power, and may transmit the RAM payloadwith a lower transmit power. As further shown, the transmit power usedto transmit the RAM preamble may be higher than a transmit power usedfor the RAM payload and may be higher than a transmit power used forother uplink transmissions that occur in parallel with the RAM preamble.In some aspects, the transmit power for the RAM payload and the transmitpower for the parallel uplink transmissions may be the same. In thisway, the UE 120 may prioritize transmission of the RAM preamble over theRAM payload and other uplink transmissions that overlap with the RAMpreamble.

In some aspects, the UE 120 may apply dynamic power sharing or otherpower control schemes to enable the techniques described above. Forexample, the UE 120 may adjust a transmit power used for one or morecarriers to accommodate transmission of the RAM preamble or the RAMpayload as described above, subject to a total power constraint acrossCCs (such as P_(MAX)) or a peak power constraint per CC (such asP_(1,MAX), P_(2,MAX), and so on). For example, the UE 120 may adjust aratio of transmit power across different CCs.

In some aspects, the UE 120 may dynamically configure a transmit powerfor a RAM preamble or a RAM payload using a power control formula. Thepower control formula for the RAM preamble may be based on one or moreof a transmission occasion in which the RAM preamble is to betransmitted, a carrier (a CC) to be used to transmit the RAM preamble, apathloss measurement for the carrier, a transmission bandwidth assignedfor transmission of the RAM preamble, a power spectral density targetfor transmission of the RAM preamble, a pathloss compensation factor fortransmission of the RAM preamble, or the like. Similarly, the powercontrol formula for the RAM payload may be based on one or more of atransmission occasion in which the RAM payload is to be transmitted, acarrier (a CC) to be used to transmit the RAM payload, a pathlossmeasurement for the carrier, a transmission bandwidth assigned fortransmission of the RAM payload, a power spectral density target fortransmission of the RAM payload, a pathloss compensation factor fortransmission of the RAM payload, or the like.

In some aspects, the power control formula for determining a transmitpower P_(msgA) for a RAM transmission (msgA) may be as follows:P _(msgA)(i,j,l)=min{P _(max)(j),10 log(M(i,j))+P₀(i,j)+α(i,j)PL(j,l)+Δ_(TF)(i,j,l)}

In the above power control formula, i may represent an index oftransmission occasion for the RAM preamble or the RAM payload, j mayrepresent an index of the uplink carrier (the uplink CC), 1 mayrepresent an index of a two-step RACH UE, Pmax(j) may represent amaximum transmit power (a peak power constraint) on carrier j, M(i, j)may represent a transmission bandwidth assigned for RAM transmission onoccasion i and carrier j, P₀(i, j) may represent a power spectraldensity target of power control for RAM transmission on occasion i andcarrier j, α(i, j) may represent a pathloss compensation factor for RAMtransmission on occasion i and carrier j, PL(j, l) may represent apathloss measurement of UE l on carrier j, and Δ_(TF)(i, j, l) mayrepresent a power offset related to a transport format.

By balancing QoS requirements and consumption of high priority networkresources when transmitting a RAM in a two-step RACH procedure, the UE120 may be capable of reducing latency or increasing reliability of theRAM transmission while reducing an impact of transmission of the RAM onother uplink transmissions when appropriate.

FIG. 8 is a diagram illustrating an example process 800 performed, forexample, by a UE. Example process 800 is an example where a UE (such asUE 120 or the like) performs operations associated with priorityhandling for a random access message that includes a preamble and apayload.

As shown in FIG. 8, in some aspects, process 800 may include determininga QoS requirement associated with a payload of a random access message,where the random access message includes a preamble and the payload(block 810). For example, the UE (such as using receive processor 258,transmit processor 264, controller/processor 280, memory 282, or thelike) may determine a QoS requirement associated with a payload of arandom access message, as described above. In some aspects, the randomaccess message includes a preamble and the payload.

As further shown in FIG. 8, in some aspects, process 800 may includetransmitting the preamble and the payload based on a priority that isdetermined using the QoS requirement (block 820). For example, the UE(such as using receive processor 258, transmit processor 264,controller/processor 280, memory 282, or the like) may transmit thepreamble and the payload based on a priority that is determined usingthe QoS requirement, as described above.

Process 800 may include additional aspects, such as any singleimplementation or any combination of aspects described below or inconnection with one or more other processes described elsewhere herein.

In a first aspect, the priority is determined based on a determinationthat the UE is operating in a carrier aggregation mode, a dualconnectivity mode, or a supplemental uplink mode.

In a second aspect, alone or in combination with the first aspect, thepriority relates to multiple cell groups, multiple frequency ranges, ormultiple component carriers with which the UE is configured to operate.

In a third aspect, alone or in combination with one or more of the firstthrough second aspects, the priority indicates at least one of: a cellgroup on which at least one of the preamble or the payload is to betransmitted, a component carrier on which at least one of the preambleor the payload is to be transmitted, a transmission power with which atleast one of the preamble or the payload is to be transmitted, or acombination thereof.

In a fourth aspect, alone or in combination with one or more of thefirst through third aspects, the preamble and the payload aretransmitted using a same cell group based on a determination that theQoS requirement satisfies a threshold.

In a fifth aspect, alone or in combination with one or more of the firstthrough fourth aspects, the threshold is based on at least one of acollision probability of random selection of preamble or DMRS sequences,available transmission occasions on different uplink carriers, one ormore channel quality measurements, one or more interferencemeasurements, or a combination thereof.

In a sixth aspect, alone or in combination with one or more of the firstthrough fifth aspects, the preamble and the payload are transmittedusing different cell groups based on a determination that the QoSrequirement does not satisfy a threshold.

In a seventh aspect, alone or in combination with one or more of thefirst through sixth aspects, the priority is determined based on whetherthe random access message is to be transmitted as an initialtransmission or a re-transmission.

In an eighth aspect, alone or in combination with one or more of thefirst through seventh aspects, the priority is determined based on adetermination that the UE is configured with a first cell group thatuses a first frequency range and is configured with a second cell groupthat uses a second frequency range.

In a ninth aspect, alone or in combination with one or more of the firstthrough eighth aspects, the first frequency range is a sub-6 gigahertzfrequency range and the second frequency range is at least one of amillimeter wave frequency range, a different carrier frequency withinthe sub-6 gigahertz frequency range that has a different pathloss thanthe first frequency range, or an unlicensed spectrum frequency range.

In a tenth aspect, alone or in combination with one or more of the firstthrough ninth aspects, the preamble and the payload are transmittedusing the first cell group based on a determination that the QoSrequirement satisfies a threshold.

In an eleventh aspect, alone or in combination with one or more of thefirst through tenth aspects, the threshold is based on at least one of acollision probability of random selection of preamble or DMRS sequences,available transmission occasions on different uplink carriers, one ormore channel quality measurements, one or more interferencemeasurements, or a combination thereof.

In a twelfth aspect, alone or in combination with one or more of thefirst through eleventh aspects, the preamble is transmitted using thefirst cell group and the payload is transmitted using the second cellgroup based on a determination that the QoS requirement does not satisfya threshold.

In a thirteenth aspect, alone or in combination with one or more of thefirst through twelfth aspects, the preamble and the payload aretransmitted using a different cell group for a first transmissionoccasion and are transmitted using a same cell group for a secondtransmission occasion.

In a fourteenth aspect, alone or in combination with one or more of thefirst through thirteenth aspects, the priority is determined based on adetermination that the UE is configured with a first cell group having ahigher density of transmission occasions or a higher peak powerconstraint and a second cell group having a lower density oftransmission occasions or a lower peak power constraint.

In a fifteenth aspect, alone or in combination with one or more of thefirst through fourteenth aspects, the first cell group and the secondcell group use a same frequency range.

In a sixteenth aspect, alone or in combination with one or more of thefirst through fifteenth aspects, the preamble and the payload aretransmitted using the first cell group based on a determination that theQoS requirement satisfies a threshold.

In a seventeenth aspect, alone or in combination with one or more of thefirst through sixteenth aspects, the preamble is transmitted using thefirst cell group and the payload is transmitted using the second cellgroup based on a determination that the QoS requirement does not satisfya threshold.

In an eighteenth aspect, alone or in combination with one or more of thefirst through seventeenth aspects, the preamble and the payload aretransmitted using a same transmit power based on a determination thatthe QoS requirement satisfies a threshold.

In a nineteenth aspect, alone or in combination with one or more of thefirst through eighteenth aspects, the same transmit power is higher thana transmit power used for other uplink transmissions that overlap withthe preamble or the payload of the random access message.

In a twentieth aspect, alone or in combination with one or more of thefirst through nineteenth aspects, the preamble and the payload aretransmitted using different transmit powers based on a determinationthat the QoS requirement does not satisfy a threshold.

In a twenty-first aspect, alone or in combination with one or more ofthe first through twentieth aspects, the threshold is based on at leastone of a collision probability of random selection of preamble or DMRSsequences, available transmission occasions on different uplinkcarriers, one or more channel quality measurements, one or moreinterference measurements, or a combination thereof.

In a twenty-second aspect, alone or in combination with one or more ofthe first through twenty-first aspects, a first transmit power used forthe preamble is higher than a second transmit power used for the payloadand is higher than a transmit power used for other uplink transmissionsthat overlap with the preamble of the random access message.

In a twenty-third aspect, alone or in combination with one or more ofthe first through twenty-second aspects, the UE is configured to disableuplink transmissions that overlap with the preamble or the payload ofthe random access message.

In a twenty-fourth aspect, alone or in combination with one or more ofthe first through twenty-third aspects, the uplink transmissions aredisabled on one or more carriers that are not configured withtransmission occasions for the random access message.

In a twenty-fifth aspect, alone or in combination with one or more ofthe first through twenty-fourth aspects, uplink control information forthe disabled uplink transmissions is multiplexed with the payload of therandom access message.

In a twenty-sixth aspect, alone or in combination with one or more ofthe first through twenty-fifth aspects, a transmit power for thepreamble is dynamically configured based on at least one of: atransmission occasion in which the preamble is to be transmitted, acarrier to be used to transmit the preamble, a pathloss measurement forthe carrier, a transmission bandwidth assigned for transmission of thepreamble, a power spectral density target for transmission of thepreamble, a pathloss compensation factor for transmission of thepreamble, or a combination thereof.

In a twenty-seventh aspect, alone or in combination with one or more ofthe first through twenty-sixth aspects, a transmit power for the payloadis dynamically configured based on at least one of: a transmissionoccasion in which the payload is to be transmitted, a carrier to be usedto transmit the payload, a pathloss measurement for the carrier, atransmission bandwidth assigned for transmission of the payload, a powerspectral density target for transmission of the payload, a pathlosscompensation factor for transmission of the payload, or a combinationthereof.

In a twenty-eighth aspect, alone or in combination with one or more ofthe first through twenty-seventh aspects, the QoS requirement is basedat least in part on an RSRP parameter.

Although FIG. 8 shows example blocks of process 800, in some aspects,process 800 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 8.Additionally, or alternatively, two or more of the blocks of process 800may be performed in parallel.

FIG. 9 is a diagram illustrating an example process 900 performed, forexample, by a UE. Example process 900 is an example where a UE (such asUE 120 or the like) performs operations associated with priorityhandling for a random access message that includes a preamble and apayload.

As shown in FIG. 9, in some aspects, process 900 may include determininga first transmit power for transmission of a preamble of a random accessmessage based at least in part on a first set of parameters (block 910).For example, the UE (for example, using receive processor 258, transmitprocessor 264, controller/processor 280, memory 282, or the like) maydetermine a first transmit power for transmission of a preamble of arandom access message based at least in part on a first set ofparameters, as described above.

As shown in FIG. 9, in some aspects, process 900 may include determininga second transmit power for transmission of a payload of the randomaccess message based at least in part on a second set of parameters,where the random access message includes both the preamble and thepayload (block 920). For example, the UE (for example, using receiveprocessor 258, transmit processor 264, controller/processor 280, memory282, or the like) may determine a second transmit power for transmissionof a payload of the random access message based at least in part on asecond set of parameters, as described above. In some aspects, therandom access message includes both the preamble and the payload.

As shown in FIG. 9, in some aspects, process 900 may includetransmitting the preamble using the first transmit power (block 930).For example, the UE (for example, using transmit processor 264,controller/processor 280, memory 282, or the like) may transmit thepreamble using the first transmit power, as described above.

As shown in FIG. 9, in some aspects, process 900 may includetransmitting the payload using the second transmit power (block 940).For example, the UE (for example, using transmit processor 264,controller/processor 280, memory 282, or the like) may transmit thepayload using the second transmit power, as described above.

Process 900 may include additional aspects, such as any single aspect orany combination of aspects described below or in connection with one ormore other processes described elsewhere herein.

In a first aspect, the first set of parameters is different from thesecond set of parameters.

In a second aspect, alone or in combination with the first aspect, thefirst set of parameters includes at least one of: a transmissionoccasion in which the preamble is to be transmitted, a carrier to beused to transmit the preamble, a pathloss measurement for the carrier tobe used to transmit the preamble, a transmission bandwidth assigned fortransmission of the preamble, a power spectral density target fortransmission of the preamble, a pathloss compensation factor fortransmission of the preamble, or a combination thereof.

In a third aspect, alone or in combination with one or more of the firstand second aspects, the second set of parameters includes at least oneof: a transmission occasion in which the payload is to be transmitted, acarrier to be used to transmit the payload, a pathloss measurement forthe carrier to be used to transmit the payload, a transmission bandwidthassigned for transmission of the payload, a power spectral densitytarget for transmission of the payload, a pathloss compensation factorfor transmission of the payload, or a combination thereof.

In a fourth aspect, alone or in combination with one or more of thefirst through third aspects, at least one of the first transmit power orthe second transmit power is higher than a transmit power used for otheruplink transmissions that overlap with the preamble or the payload ofthe random access message.

In a fifth aspect, alone or in combination with one or more of the firstthrough fourth aspects, the other uplink transmissions include at leastone of an SRS, a PUCCH communication, or a PUSCH transmission.

In a sixth aspect, alone or in combination with one or more of the firstthrough fifth aspects, the first transmit power is higher than thesecond transmit power.

Although FIG. 9 shows example blocks of process 900, in some aspects,process 900 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 9.Additionally, or alternatively, two or more of the blocks of process 900may be performed in parallel.

The foregoing disclosure provides illustration and description, but isnot intended to be exhaustive or to limit the aspects to the preciseform disclosed. Modifications and variations may be made in light of theabove disclosure or may be acquired from practice of the aspects.

As used herein, the term “component” is intended to be broadly construedas hardware, firmware, or a combination of hardware and software. Asused herein, a processor is implemented in hardware, firmware, or acombination of hardware and software. As used herein, the phrase “basedon” is intended to be broadly construed to mean “based at least in parton.”

Some aspects are described herein in connection with thresholds. As usedherein, satisfying a threshold may refer to a value being greater thanthe threshold, greater than or equal to the threshold, less than thethreshold, less than or equal to the threshold, equal to the threshold,not equal to the threshold, or the like.

As used herein, a phrase referring to “at least one of” a list of itemsrefers to any combination of those items, including single members. Asan example, “at least one of: a, b, or c” is intended to cover: a, b, c,a-b, a-c, b-c, and a-b-c.

The various illustrative logics, logical blocks, modules, circuits andalgorithm processes described in connection with the aspects disclosedherein may be implemented as electronic hardware, computer software, orcombinations of both. The interchangeability of hardware and softwarehas been described generally, in terms of functionality, and illustratedin the various illustrative components, blocks, modules, circuits andprocesses described above. Whether such functionality is implemented inhardware or software depends upon the particular application and designconstraints imposed on the overall system.

The hardware and data processing apparatus used to implement the variousillustrative logics, logical blocks, modules and circuits described inconnection with the aspects disclosed herein may be implemented orperformed with a general purpose single- or multi-chip processor, adigital signal processor (DSP), an application specific integratedcircuit (ASIC), a field programmable gate array (FPGA) or otherprogrammable logic device, discrete gate or transistor logic, discretehardware components, or any combination thereof designed to perform thefunctions described herein. A general purpose processor may be amicroprocessor, or, any conventional processor, controller,microcontroller, or state machine. A processor also may be implementedas a combination of computing devices, for example, a combination of aDSP and a microprocessor, a plurality of microprocessors, one or moremicroprocessors in conjunction with a DSP core, or any other suchconfiguration. In some aspects, particular processes and methods may beperformed by circuitry that is specific to a given function.

In one or more aspects, the functions described may be implemented inhardware, digital electronic circuitry, computer software, firmware,including the structures disclosed in this specification and theirstructural equivalents thereof, or in any combination thereof. Aspectsof the subject matter described in this specification also can beimplemented as one or more computer programs, i.e., one or more modulesof computer program instructions, encoded on a computer storage mediafor execution by, or to control the operation of, data processingapparatus.

If implemented in software, the functions may be stored on ortransmitted over as one or more instructions or code on acomputer-readable medium. The processes of a method or algorithmdisclosed herein may be implemented in a processor-executable softwaremodule which may reside on a computer-readable medium. Computer-readablemedia includes both computer storage media and communication mediaincluding any medium that can be enabled to transfer a computer programfrom one place to another. A storage media may be any available mediathat may be accessed by a computer. By way of example, and notlimitation, such computer-readable media may include RAM, ROM, EEPROM,CD-ROM or other optical disk storage, magnetic disk storage or othermagnetic storage devices, or any other medium that may be used to storedesired program code in the form of instructions or data structures andthat may be accessed by a computer. Also, any connection can be properlytermed a computer-readable medium. Disk and disc, as used herein,includes compact disc (CD), laser disc, optical disc, digital versatiledisc (DVD), floppy disk, and Blu-ray disc where disks usually reproducedata magnetically, while discs reproduce data optically with lasers.Combinations of the above should also be included within the scope ofcomputer-readable media. Additionally, the operations of a method oralgorithm may reside as one or any combination or set of codes andinstructions on a machine readable medium and computer-readable medium,which may be incorporated into a computer program product.

Various modifications to the aspects described in this disclosure may bereadily apparent to those skilled in the art, and the generic principlesdefined herein may be applied to other aspects without departing fromthe spirit or scope of this disclosure. Thus, the claims are notintended to be limited to the aspects shown herein, but are to beaccorded the widest scope consistent with this disclosure, theprinciples and the novel features disclosed herein.

Additionally, a person having ordinary skill in the art will readilyappreciate, the terms “upper” and “lower” are sometimes used for ease ofdescribing the figures, and indicate relative positions corresponding tothe orientation of the figure on a properly oriented page, and may notreflect the proper orientation of any device as implemented.

Certain features that are described in this specification in the contextof separate aspects also can be implemented in combination in a singleaspect. Conversely, various features that are described in the contextof a single aspect also can be implemented in multiple aspectsseparately or in any suitable sub-combination. Moreover, althoughfeatures may be described above as acting in certain combinations andeven initially claimed as such, one or more features from a claimedcombination can in some cases be excised from the combination, and theclaimed combination may be directed to a sub-combination or variation ofa sub-combination.

Similarly, while operations are depicted in the drawings in a particularorder, this should not be understood as requiring that such operationsbe performed in the particular order shown or in sequential order, orthat all illustrated operations be performed, to achieve desirableresults. Further, the drawings may schematically depict one more exampleprocesses in the form of a flow diagram. However, other operations thatare not depicted can be incorporated in the example processes that areschematically illustrated. For example, one or more additionaloperations can be performed before, after, simultaneously, or betweenany of the illustrated operations. In certain circumstances,multitasking and parallel processing may be advantageous. Moreover, theseparation of various system components in the aspects described aboveshould not be understood as requiring such separation in all aspects,and it should be understood that the described program components andsystems can generally be integrated together in a single softwareproduct or packaged into multiple software products. Additionally, otheraspects are within the scope of the following claims. In some cases, theactions recited in the claims can be performed in a different order andstill achieve desirable results.

What is claimed is:
 1. A method of wireless communication performed byan apparatus of a user equipment (UE), comprising: determining a firsttransmit power for transmission of a preamble of a random access messagebased at least in part on one or more carriers, wherein the one or morecarriers are to transmit the preamble or a payload of the random accessmessage, and wherein a priority of one or more of the preamble or thepayload is associated with the one or more carriers; determining asecond transmit power for transmission of the payload associated withthe one or more carriers, wherein the payload includes a physical uplinkshared channel (PUSCH) communication, and wherein the random accessmessage includes both the preamble and the payload; transmitting thepreamble using the first transmit power; and transmitting the payloadusing the second transmit power, wherein the first transmit power andthe second transmit power are associated with a transmissionprioritization used to accommodate a power constraint, and whereintransmitting the preamble using the first transmit power is prioritizedover other uplink transmissions that overlap with the preamble.
 2. Themethod of claim 1, wherein the first transmit power is determined basedat least in part on a first set of parameters, wherein the secondtransmit power is determined based at least in part on a second set ofparameters, and wherein the first set of parameters is different fromthe second set of parameters.
 3. The method of claim 2, wherein thefirst set of parameters includes at least one of: a transmissionoccasion in which the preamble is to be transmitted, a pathlossmeasurement for a carrier to be used to transmit the preamble, atransmission bandwidth assigned for transmission of the preamble, apower spectral density target for transmission of the preamble, or apathloss compensation factor for transmission of the preamble.
 4. Themethod of claim 2, wherein the second set of parameters includes atleast one of: a transmission occasion in which the payload is to betransmitted, a pathloss measurement for a carrier to be used to transmitthe payload, a transmission bandwidth assigned for transmission of thepayload, a power spectral density target for transmission of thepayload, or a pathloss compensation factor for transmission of thepayload.
 5. The method of claim 1, wherein at least one of the firsttransmit power or the second transmit power is prioritized over atransmit power used for the other uplink transmissions, wherein theother uplink transmission overlap with the preamble or the payload. 6.The method of claim 5, wherein the other uplink transmissions include aphysical uplink control channel (PUCCH) communication.
 7. The method ofclaim 5, wherein the other uplink transmissions include a PUSCHtransmission.
 8. The method of claim 1, wherein the preamble and thepayload are transmitted using a same carrier.
 9. An apparatus forwireless communication, comprising: a memory; and one or more processorscoupled to the memory, the one or more processors configured to:determine a first transmit power for transmission of a preamble of arandom access message based at least in part on one or more carriers,wherein the one or more carriers are to transmit the preamble or apayload of the random access message, and wherein a priority of one ormore of the preamble or the payload is associated with the one or morecarriers; determine a second transmit power for transmission of thepayload associated with the one or more carriers, wherein the payloadincludes a physical uplink shared channel (PUSCH) communication, andwherein the random access message includes both the preamble and thepayload; transmit the preamble using the first transmit power; andtransmit the payload using the second transmit power, wherein the firsttransmit power and the second transmit power are associated with atransmission prioritization used to accommodate a power constraint, andwherein transmitting the preamble using the first transmit power isprioritized over other uplink transmission that overlap with thepreamble.
 10. The apparatus of claim 9, wherein the first transmit poweris determined based at least in part on a first set of parameters,wherein the second transmit power is determined based at least in parton a second set of parameters, and wherein the first set of parametersis different from the second set of parameters.
 11. The apparatus ofclaim 10, wherein the first set of parameters includes at least one of:a transmission occasion in which the preamble is to be transmitted, apathloss measurement for a carrier to be used to transmit the preamble,a transmission bandwidth assigned for transmission of the preamble, apower spectral density target for transmission of the preamble, or apathloss compensation factor for transmission of the preamble.
 12. Theapparatus of claim 10, wherein the second set of parameters includes atleast one of: a transmission occasion in which the payload is to betransmitted, a pathloss measurement for a carrier to be used to transmitthe payload, a transmission bandwidth assigned for transmission of thepayload, a power spectral density target for transmission of thepayload, or a pathloss compensation factor for transmission of thepayload.
 13. The apparatus of claim 9, wherein at least one of the firsttransmit power or the second transmit power is prioritized over atransmit power used for the other uplink transmissions, wherein theother uplink transmissions overlap with the preamble or the payload. 14.The apparatus of claim 13, wherein the other uplink transmissionsinclude a physical uplink control channel (PUCCH) communication.
 15. Theapparatus of claim 13, wherein the other uplink transmissions include aPUSCH transmission.
 16. The apparatus of claim 9, wherein the randomaccess message is a first message of a two-step random access procedurethat includes both the preamble and the payload.
 17. The apparatus ofclaim 9, wherein the preamble and the payload are transmitted using asame carrier.
 18. A method of wireless communication performed by anapparatus of a user equipment (UE), comprising: determining a firsttransmit power for transmission of a preamble of a random access messagebased at least in part on a first set of parameters, wherein the firstset of parameters, associated with the determining the first transmitpower for transmission of the preamble, includes a carrier to transmitthe preamble and a payload of the random access message; determining asecond transmit power for transmission of the payload associated with asecond set of parameters, wherein the random access message includesboth the preamble and the payload, and wherein the second set ofparameters, associated with the determining the second transmit powerfor transmission of the payload, includes the carrier; transmitting thepreamble using the first transmit power; and transmitting the payloadusing the second transmit power.
 19. The method of claim 18, wherein thefirst set of parameters is different from the second set of parameters.20. The method of claim 18, wherein the first set of parameters furtherincludes at least one of: a transmission occasion in which the preambleis to be transmitted, a pathloss measurement for the carrier, atransmission bandwidth assigned for transmission of the preamble, apower spectral density target for transmission of the preamble, or apathloss compensation factor for transmission of the preamble.
 21. Themethod of claim 18, wherein the second set of parameters furtherincludes at least one of: a transmission occasion in which the payloadis to be transmitted, a pathloss measurement for the carrier, atransmission bandwidth assigned for transmission of the payload, a powerspectral density target for transmission of the payload, or a pathlosscompensation factor for transmission of the payload.
 22. The method ofclaim 18, wherein at least one of the first transmit power or the secondtransmit power is prioritized over a transmit power used for otheruplink transmissions that overlap with the preamble or the payload. 23.An apparatus for wireless communication, comprising: a memory; and oneor more processors coupled to the memory, the one or more processorsconfigured to: determine a first transmit power for transmission of apreamble of a random access message based at least in part on a firstset of parameters, wherein the first set of parameters, associated withthe determining the first transmit power for transmission of thepreamble, includes a carrier to transmit the preamble and a payload ofthe random access message; determine a second transmit power fortransmission of the payload associated with a second set of parameters,wherein the random access message includes both the preamble and thepayload, and wherein the second set of parameters, associated with thedetermining the second transmit power for transmission of the payload,includes the carrier; transmit the preamble using the first transmitpower; and transmit the payload using the second transmit power.
 24. Theapparatus of claim 23, wherein the first set of parameters is differentfrom the second set of parameters.
 25. The apparatus of claim 23,wherein the first set of parameters further includes at least one of: atransmission occasion in which the preamble is to be transmitted, apathloss measurement for the carrier, a transmission bandwidth assignedfor transmission of the preamble, a power spectral density target fortransmission of the preamble, or a pathloss compensation factor fortransmission of the preamble.
 26. The apparatus of claim 23, wherein thesecond set of parameters further includes at least one of: atransmission occasion in which the payload is to be transmitted, apathloss measurement for the carrier, a transmission bandwidth assignedfor transmission of the payload, a power spectral density target fortransmission of the payload, or a pathloss compensation factor fortransmission of the payload.
 27. The apparatus of claim 23, wherein atleast one of the first transmit power or the second transmit power isprioritized over a transmit power used for other uplink transmissionsthat overlap with the preamble or the payload.
 28. The apparatus ofclaim 27, wherein the other uplink transmissions include a soundingreference signal (SRS).
 29. The apparatus of claim 23, wherein therandom access message is a first message of a two-step random accessprocedure, wherein the first set of parameters further includes an indexof transmission occasion for the first message of the two-step randomaccess procedure, and wherein the second set of parameters furtherincludes the index of transmission occasion for the first message of thetwo-step random access procedure.
 30. The apparatus of claim 23, whereinthe first transmit power and the second transmit power are associatedwith a transmission prioritization used to accommodate a powerconstraint when the apparatus is operating in a supplemental uplinkmode.